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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 365 | else |
| 366 | $depth = -1; // Flat. |
| 367 | |
| 368 | $output .= walk_category_dropdown_tree( $categories, $depth, $r ); |
| 369 | } |
| 370 | |
| 371 | if ( ! $r['hide_if_empty'] || ! empty($categories) ) |
| 372 | $output .= "</select>\n"; |
| 373 | |
| 374 | $output = apply_filters( 'wp_dropdown_cats', $output ); |
| 375 | |
| 376 | if ( $echo ) |
| 377 | echo $output; |
| 378 | |
| 379 | return $output; |
| 380 | } |
| 381 | |
| 382 | /** |
| 383 | * Display or retrieve the HTML list of categories. |